OK I found out the way to do this from other sites... Say you want to copy the tab from here:
www.geocities.com/xxsdmfxx/lesson1.htmland paste into this site... This is what you will come up with:
e----------------------------------------------------------------------------------
b----------------------------------------------------------------------------------
g----------------------------------------------------------------------------------
d-------------------7-5-3---------------------------7-5-3--------------------------
a---3-7-3---5-7-5-3-------7-5-3-----3-7-3---5-7-5-3-------7-5-3-----4-7-4---5-8-5--
e-5-------7---------------------7-5-------7---------------------7-5-------5--------
e--------------------------------------------------
b--------------------------------------------------
g--------------------------------------------------
d-----3---------------------7-5-3------------/7~---
a-----------3-7-3---5-7-5-3-------7-5-3------------
e-3-7---7-3-------7---------------------7-5~~~-----
e------------------------------------------------------------------------
b-------------------10-8-6---------------------------10-8-6--------------
g---5-9-5---7-9-7-5--------9-7-5-----5-9-5---7-9-7-5--------9-7-5--------
d-7-------9----------------------9-7-------9----------------------9-7~~--
a------------------------------------------------------------------------
e------------------------------------------------------------------------
e-/15-15-13-12---------------------------------------------(12)---
b--------------15-13-12------------------------------------(12)---
g-----------------------14-12------------------------------(12)---
d-----------------------------15-14-12----------------------------
a--------------------------------------15-14-12 12~~--(12)--------
e----------------------------------------------------------(12)---
Now what you do IS. Click the 'pre' button, 8th from the left on the top bar, it looks like a really fuck up paragraph. Pre is a code from HTML which does exactly the same thing...
when you get the pre code... paste the tab into the area betwee the code
e----------------------------------------------------------------------------------
b----------------------------------------------------------------------------------
g----------------------------------------------------------------------------------
d-------------------7-5-3---------------------------7-5-3--------------------------
a---3-7-3---5-7-5-3-------7-5-3-----3-7-3---5-7-5-3-------7-5-3-----4-7-4---5-8-5--
e-5-------7---------------------7-5-------7---------------------7-5-------5--------
e--------------------------------------------------
b--------------------------------------------------
g--------------------------------------------------
d-----3---------------------7-5-3------------/7~---
a-----------3-7-3---5-7-5-3-------7-5-3------------
e-3-7---7-3-------7---------------------7-5~~~-----
e------------------------------------------------------------------------
b-------------------10-8-6---------------------------10-8-6--------------
g---5-9-5---7-9-7-5--------9-7-5-----5-9-5---7-9-7-5--------9-7-5--------
d-7-------9----------------------9-7-------9----------------------9-7~~--
a------------------------------------------------------------------------
e------------------------------------------------------------------------
e-/15-15-13-12---------------------------------------------(12)---
b--------------15-13-12------------------------------------(12)---
g-----------------------14-12------------------------------(12)---
d-----------------------------15-14-12----------------------------
a--------------------------------------15-14-12 12~~--(12)--------
e----------------------------------------------------------(12)---