check box will not activate

[survivo01]

I have entered a checkbox. I have tried to protect the document by ignoring #1, using fill in form for #2, and #3 is grayed out and cannot seem to activate form.

[Stefan Blom]

Which kind of check box did you choose? Make sure that you didn't pick one of the ActiveX controls found under the "ActiveX Controls" label at Developer tab | Legacy Tools.

If you did choose a forms check box, make sure that the document isn't in Design mode. Click the button on the Developer tab to turn off the setting.