small logo in tab of my browser

[nhawk]

You can have it change instantly.

1) Upload the icon as a file named something other than favicon.ico. (IE: myicon.ico)

2) Go to ACP->Styles & Templates->Style Manager

3) For the style you're using use the 'Style Variable Editor'.
Once the list comes up type ico in the search box in the upper left corner.

4) Under ImagePaths, select and change favicon to your newly named icon.

Once saved, the icon should instantly change in your browser the next time you view a page in your forum.