cant click buttons on creative inventory or menu

I have minecraft java open with the mr craynfish furniture mod and secuirty mod and i cant click the creative inventory buttons or menu buttons

What I expected to happen was...:
click the buttons on the screen

What actually happened was...:
I have minecraft java open with the mr craynfish furniture mod and secuirty mod and i cant click the creative inventory buttons or menu buttons

Steps to Reproduce:
do not understand the task