if you want to add some sort of “Accept T&C’s” simply use one of the “order form” form fields to add that (presumably with a type of “checkbox” and making it required on “delivery” and “pickup”

(if you are using the “confirmation page” option, than that’s already preconfigured as it happens – though still editable to an extend )

i don’t understand.
just make the “AGB” a link to your AGB’s ?!

(or whatever text you want to use there to link somewhere)

then make “AGB” a link to somewhere. I really cannot see the issue

surely you know how to create links … no ?
https://www.w3schools.com/html/html_links.asp

you have typed in AGB in the field.
type in <a href="somelink">AGB</a> instead (or however you want to link to it )
I.e make your “AGB akzeptieren” text you entered a link in whatever way you want to link to things

….I really don’t know how else to say this…?!

no problem, glad we got there in the end 🙂