This video shows how to enable 2FA for a Namecheap account
You may also want to check out the following reference articles:
How to regenerate backup codes for 2FA in Namecheap account
https://www.namecheap.com/support/knowledgebase/article.aspx/10073/45/how-can-i-use-the-totp-method-for-twofactor-authentication/#backup_codes
How can I use the U2F method for Two-Factor Authentication
https://www.namecheap.com/support/knowledgebase/article.aspx/10102/45/how-can-i-use-the-u2f-method-for-twofactor-authentication/
How to log into Namecheap account with TOTP 2FA
https://www.namecheap.com/support/knowledgebase/article.aspx/10073/45/how-can-i-use-the-totp-method-for-twofactor-authentication/#totp_login
How to set up 2fa for Namecheap account on multiple devices
https://www.namecheap.com/support/knowledgebase/article.aspx/10073/45/how-can-i-use-the-totp-method-for-twofactor-authentication/#regenerate_qr
