Problem with the bookmarklet

When I use the bookmarklet, I saw the following message, and I cannot import a text.

You must upgrade to Basic, Plus or Premium to use the bookmarklet

How can we upgrade to these grade? Thanks.

Sorry, now I use my active accout.

Sorry for posting it again. I had clicked “Post”. Now I have just clicked “Post and Submit for Correction” in order that a tutor correct my message.

Oh, now, I tried it again, the bookmarklet works well!

Sorry for posting it again.

I finally understood this system. It means, when we are free account user, we cannot use this bookmarklet.
Just a few minutes ago, I used another free account, so I cannot use this service.