I believe he wants to know how to edit it... So I will make this as seemless as possible:
Step One: Right-click your realmlist.wtf file.
Step Two: On the little menu that pops up, click Open.
Step Three: A dialog box comes up asking you a few questions, choose "Select the program from a list".
Step Four: Select Notepad from the large list.
Step Five: It should open the file with one line inside, change the domain name it currently has and leave the "set realmlist" part.
Step Six: Save and exit the Notepad document.
Step Seven: Run your World of Warcraft client and log in with the x10gaming.com WoW account you created earlier.
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Thanks,
-civilr