Can someone help me add a server status indicator to https://meowmsn.weebly.com?
It’s Weebly. To my knowledge, you can’t use any server-side scripts on webpages when it comes to that. I don’t think you can even use custom web pages. 
It’s best to move all of the web content to meowmsn.ddns.net (the actual MSNP server) and set up an HTTP server on your end. Then you can set up the server status stuff later.
well I don’t wanna buy a domain 
I’ll just try something else then
I mentioned meowmsn.ddns.net, the actual MSNP server you own. Since “.ddns.net” domains are a part of that NoIP thing to create a free domain to an IP you own, you can set up an HTTP server on your computer, and either create your own web pages, or ask someone to help you. 