Limit the number of items that can be selected on a checklist

where i can limit the number of items that I can check off? 

I have checked the most recent form you have updated. There are a lot of checkboxes in it and I don't know which one are you referring to.

Can you give us more details about your requirements, please?

If it will help you in explaining to us what you would like to happen, you can use and upload screenshots in your next reply.

https://www.jotform.com/help/438-How-to-Post-Screenshots-to-Our-Support-Forum

As for your other concern, I have moved it to a new thread considering it is about another topic.

Here's the link to the new thread: https://www.jotform.com/answers/2190037

We will reply to that thread shortly.