[SEOvB]

1. Create your custom profile field and remember what the ID# of it is

For the postbit (threads) you'll need to use $post[fieldX] then locate where you want it in the template and just add $post[fieldX] into it, if you want to make it an image, or link to something then use html code like <a href="link to something"><img alt="$post[fieldX]"src="whatever image" /></a>

UserCP is taken care of when you create the custom profile field

No clue what you mean by the tag html

Turn viewable on memberlist when creating custom profile field and it should take care of the last two