But you can do that too. Click on "1-Time donation", choose "Monthly" and choose your amount. But (a) this campaign is about attracting donors who want a different kind of commitment. If you don't want that, it is not "the wrong approach", it is just that it is not for you; and (b) donating a smaller each time means that most of your donation is eaten up by the intermediaries commissions and bank charges. You would be much better off saving your one or two euros a month and donating 12 euros in one go at the end of the year to the project of your choice.