This displays your thread limit and your current thread usage. You can find this by clicking on the "Webstats" tab and then selecting "Real-Time" from the dropdown.

You will not be able to exceed this limit. If your connections go over your Allowed number then you will receive a connection closed response if you are using SOCKS protocol or a 466 error if you are using HTTP protocol.

Your Current value is automatically updated and you do not need to refresh the page to see the latest value.

If you need more threads you can purchase a larger package.