How do i use breakpoints when testing servers in studio?

I'm trying to fix something that doesn't give any errors in output. Everything works fine in solo, but when I test with servers, idk how to use breakpoints. How do i use the debugger??

An easy way to find a breakpoint in your script is using print()s. E.G

local num = 5
print("ok")
if num == 5 then
	print("ok2")
	num = 3
	if num == 4 then
		print("ok3")
	end
end

In this case, it will print up to "ok2", but not "ok3".