You said : "I creating a forum", which I took to mean that you are creating a Userform ... it doesn't sound like that is the case.
If you are embedding a check-box in a worksheet there a 2 types that can be used ... it could be that you are using a check-box from the Forms Toolbar. Do not use that one, use the one from the Control Toolbox Toolbar, which has properties that can be altered.