You can edit your agent profile in the Boost dashboard. Tap on your name in the top right hand corner of your dashboard and choose "Account Settings"
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You'll be brought to your profile page to edit your contact information and photo that will be shown on your ads and landing pages:

NOTE: You may only see the ability to edit your photo and name. If this is the case, it's because Boost is receiving all other contact information for you from a feed provided by your brokerage. If you're not sure where to edit the rest of your profile information, please reach out to your company's Boost administrator for help.