Specific questions about hex editing for patching cross controller.

[Oo1Toyo1oO]

I have a few specific questions about the hex editing process for cross controller, i know you guys made a DNS server but im still interested in it.

1. There are 3 URLS, which of them have to be changed, or can you change any, if not all of them?
   

2. Incase you want to replace it with a url that is shorter than 23 characters how do you properly zero-out the characters, can you just delete them via backspace and when the notice shows up that this will change the file size press okay, or do you have to actually like zero them out and how would you go about doing that?

3. Are the red characters normal when you replace the url with something different or does that indicate that something is wrong?