I created a site on Zymic but I can not put my
.tk domain, someone could help me solve this problem?
The error message you will be getting is something like:
You are not the only one to mention this and I recommend you search their forums for similar problems reported by their users. Take from their sales page and as you can see no mention of ccTLD domains.
If you want a host that supports everything pay for it. I recommend you check out our page about how to find a web host company that meets my needs.