When your loan offer is taken, an amount equivalent to your loan offer is deducted from your balance. First interest is also deducted at that moment from the borrower, and then divided in half. 50% goes to your balance, 50% goes to QUOINEX as loan fee.
For every day as long as the trade using your loan is held open, daily interest is deducted from borrower's balance at 7AM JST. This means if a trade is opened before 7AM JST, interest will be paid to you twice - once at trade opening, once at 7AM JST - and loan fee will also be collected twice.
On the dashboard, taken loan offers are displayed under the Loans tab, like the example below.