1) After logging into your account, click your username on the upper-right side of the screen and click on “Withdraw”.
2) Select “Bitcoin (XBT)” from the sidebar menu and “Bitcoin”. You can also select “BitGo Instant” which has the same instructions, but, while faster, costs more. Afterwards, you’ll want to click “Add address”.
3) On the same page, you’ll be given two fields to fill out. Under “Description”, you can name it anything you like, such as “Oshi Bitcoin Address”. Under “Bitcoin address” you should enter the address that you see on this page. Afterwards, enter the amount of BTC that you would like to deposit into your account while taking note of the ฿0.00050 fee required to send the funds. Make sure that you do not withdraw more than your tier allows you. To be safe, copy and paste the wallet code to avoid any typos. (Also, make sure that you do not use the exact same address in the image below and instead use the one on your own account)
4) After a few minutes, the funds should be in your account. It should take about 10 minutes or less to get to your account. If you would like a more accurate estimate, check out this page for the current median transaction confirmation time.