Thin seatpost

the post is too big. i thougt that was obvious. can i fit it in anyway? it's a simppel question.

someone said i could shim it.

"can i fit a bigger post in there?"

i understand that as that the seat post is too big? if it's too big, you have to get a thinner one. if the post is smaller, shim with a can

to measure, get a vernier gauge