Suggestion: Pledge money to help Carla

[Monica]

Anyway here's another probelm. If i want to cancel the donation and change to another sum, how do i proceed I cannot find any "button" to cancel my present choosen donation. I mean it must be possible to change one's mind.

That depends on whether the transaction was completed or not. Did you go all the way thru, and get a confirmation that it had been completed? If not, then simply close the browser, open a new browser, and start over.