When user is presented with a checkbox on a webpage. What can he/she do with it in order to place a little birdy inside it?
- check (Please, check the checkbox...)
- tick (Please, tick the checkbox...)
- mark (Please, mark the checkbox...)
You could consider select too.
Please select the checkbox.
The meaning of checkbox reported by the NOAD is the following one:
a small box on a computer screen that, when selected by the user, is filled with an X to show that the feature described alongside it has been enabled.
Consider "activate", which is described by oxforddictionaries.com as
Make (something) active or operative
The opposite operation would of course be to "deactivate" the checkbox.
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