Firstly, accept the free listing promotion.  When you go to the bottom of your home page tomorrow, it should should your 34 of the 40 free monthly promotion.   It should also show your 100 free listing promotion.

If you have pre-listed items for tomorrow, it will deduct these from the 100 between tomorrow and Sunday.  You will still have your 34 left.

Just make sure you list between tomorrow and Sunday.

Fingers crossed !  Last time we were offered 100 free listings, we actually got 150 .... I live in hope 🙂

I hope this helps