Do you really want to change your blgospot URL to .tk . you are at the right place. It is 100% possible. it is a matter of 2 minute . Just follow the following steps to change your blogspot url to .TK. The following ways really let you change your blogspot URL to .TK.
1. To change your blogspot url to .TK click here www.dot.tk
2. Then add your new Domain in the text box
if it is available you are promoted to next page
3. Now fill the boxes as below
Change the blogspot url to yours
4. set the time in which this domain is available
5. click on continue with out sign up
Note : assigning new domain name does not mean lossing the earlier blogspot url this one also used as an optional url to your blog.