To receiving them is just as simple.
If you have just bought some OTOCASH from an exchange, or are being paid in OTO then you will need to have a Receive Address so that hat then can be sent straight to your wallet. By default you will only have one Receive Address, so just right-click on it and select Copy Address. This prevents from trying to manually type it out and making errors.

Now give that address to whoever wishes to pay you (or exchange). You dont have to use the same address to receive coins for every transaction as creating a new address is very simple. Just click New Address at the bottom and then label it whatever you wish (eg. Donation from a site) so you can view individual transaction made to you easier over time.