Now Nobody Add Or Edit Or Delete Their URL Parameters In Google Webmaster Tools
Then, I searched over internet about this bug then I got some article which mentioned the similar problem in their webmaster tool. This issue was started on January 24th, Thursday and also reported in different Google Webmaster Help threads.
When you open your Google Webmaster Tool then you click on URL parameter interface to manage your URL then you see the button to edit or delete or even add URL parameter is simple not available.
John Mueller is also aware about this and he said that he already sent this issue to the appropriate team. He wrote:
Thanks for posting. It looks like the buttons have gone missing for you there, sorry! I'll check with the Webmaster Tools team to see what we can do about that.