Most hosting providers allow multiple A Records to be configured. Simply add a second A Record. Steps vary by domain hosting provider — find your provider on our list and follow the link to their configuration steps.
Then, make sure that your A records are pointing to Bitly's IP addresses:
RECORD TYPE | HOSTNAME | POINTS TO |
A | @ | 67.199.248.12 |
A | @ | 67.199.248.13 |