Prolog Insert the number in the list by the tail

How can I build a predicate in prolog that receives a number and a list, I must insert the number in the list by the tail

I tried inserting the number in the list by the head: insert(H,[P|Q],[H,P|Q]). and it works, but how can I do it by the tail?

Inserting at the tail can be done with a two-part recursive rule:

• When the list is empty, unify the result to a single-element list with the item being inserted
• When the list is not empty, unify the result to a head followed by the result of inserting into the tail of a tail.

English description is much longer than its Prolog equivalent:

ins_tail([], N, [N]).
ins_tail([H|T], N, [H|R]) :- ins_tail(T, N, R).

Demo.