Here one has options to buy GRD and IUSD tokens by paying for them with GBytes. GRD is governance tokens that allows to influence the yield policy but it costs quite a money. Because of the high price I left GRD alone. As the first try I decided to buy 300 IUSD, put my GByte address with the fund enough to cover the purchase and pressed Send.
If you buy just IUSD then you move the price and pay fees. Mark checkbox on "Set token1 amount to minimize fees" to get both, I am sure somebody will eventually want to buy those GRD from you or you can redeem them too. Probably just easier to use “Buy interest tokens” page if you want just IUSD.If you mark checkbox on "Immediately convert to stable token OUSD" then the IUSD will be automatically deposited and will start earning interest in OUSD.
As you can see I have 500.2274 IUSD deposited on smart contract ( actually I sent 500 but it added to it 0.2274, I guess as a bonus?). I have the option to close deposit any time after 12hrs of its opening as well as the option to edit Interest recipient (now it’s me but I can send earned interest to anybody). ~4 hrs have passed from the time my 500 ISDT were deposited. It already generated 0.0226 in stablecoin. Not bad, what do you think?
You can withdraw the interest without closing the deposit. Add some protection to your deposit, the weakest deposits might get closed by others. 
