found it, I need to create a new type when adding a field in CB via the admin panel. (Admin->Community Builder->Field Management->New->"Type")
because it for example says: "Web address", this means that more is added, this to be precise:
[code:1]<a href="ADDRESS">TITLE</a>[/code:1]
now I need to know how to insert an include for a css file
the only problem is, that I need to know how to make a dropdown for this, and I think that a css include should be in the head, but I think I'm mistaken