Like for the night if I want to close my computer, like how do i make it stay in the chat?

You need to run it on a different computer if you want to turn off the one its on.

so theres no way to keep it open 24/7 unless i keep my comp open all the time?

I don't understand where the confusion is on this matter.

for a bot to be in the chat, mirc must be open at all times, you can LOCK the computer as long as the user is still signed-on and it will still work.

if you need a cloud server to run it on, amazon runs web services where you can have a 1GB ram virtual private server for a year for free (except for the $1 activation fee) http://aws.amazon.com