The first step for account verification is to complete your personal details here (https://ice3x.com/account/verification)
Once you have completed this and clicked on the "Next" button, you will receive an email to which you can reply with the required documents or you can go to (https://help.ice3.com) to upload your ID, Bank statement, and proof of residence via a help desk ticket.
You first need to verify your phone number as per this article.
After this you need to complete your profile. Go to the verification tab from your accounts dashboard and click on "Upgrade to the next level".
This will lead you to a screen to fill in your details. When you click submit, you will be emailed with instructions to send your documentation to complete your profile.
To verify your bank account, you need to click on withdraw for the fiat currency on the accounts dashboard as shown below.
Click on add new account.
Fill in your bank details and an email will be sent to you with instructions on how to send in your documentation for your bank account. Once this is done, you are completely verified.
A video showing this is below: