[pauldodman]

Yes, that code doesn't exist in the latest version.

But all you are doing here is adding a new tab to your admin area, so you can put this wherever you want this new, Custom mods tab to appear.

Easiest thing might be to instead just find

{include file="admin/goodies.tpl"}

and place the code before or after that as you prefer. Where you put it though won't make any difference to the running of CDSEO, you are just making a tab to put the links in for it.