This screen simply shows you that the user intends to deposit, in this case, $10.00. You have the option to accept the deposit, which will add the dollar amount to their "balance" or reject (delete) the deposit. Notice that in this example, the user has not yet actually made the deposit, they've only alerted the system (and you) of their intention to pay this dollar amount. You should not accept deposits from this screen until you've got the money in hand either through a check, credit card payment, or actual funds transfer.
The deposit system doesn't work with "real" money, only numbers in a database. It records financial transactions based on information you tell it. If you "Accept" a deposit, ds/X assumes that you've gotten payment in that amount from the user, and will register that amount as a part of the users useable balance for conducting business within your ds/X system.