Open www.bkper.com and click Sign in.
Enter your email address (Gmail or non-Gmail email address).
Sign in with a Google Account

Accept Bkper to know who you are. Future sessions you do not need to authorize Bkper again.

Note: if you want to sign up with a non-Gmail email address:
Open www.bkper.com and click Sign in.
Click "Create account"
And then, click "Use my current email address instead"

