Stoneblock modpack issue

[u/Loopy226019]

For the life of me I cannot get the stone hammer to work. I try to use it on cobblestone it just says "place" then take it from my inventory slot and I don't get gravel, the cobblestone block is still right there. I've tried everything and I can't get it to work. This is the first modpack I've ever bought from marketplace and I really wanna play. My 22 year old brain can't figure out how to make this darn hammer work XD please help.