I decided to test gate.io today. This is how you can withdraw your Grins using Grin++ on Windows, Linux and MacOS in 3 simple steps. First, open your Grin++ wallet and wait until your address is green like this:
All you need is SMS verification and 2 Factor Authentication.
On BitForex account verification (KYC) is not always mandatory. It is necessary to go through it only to withdraw from the account of Chinese yuan (CNY) or if your daily withdraw is over 100btc. The first exchange I made for Grin was on bitforex. I still use it sometimes. I asked them today (live chat) and Slatepack expected in 3 days!!!