To edit your account profile, click your Profile Image at bottom left.
NOTE: make sure you include your church's mailing address for any mail that gets sent back for any reason. This will be the "default" return address, but you can change it for each campaign.
For instance, you may want different return addresses for each of your campuses. Set the default as your primary mailing address, but then on a campaign for a campus, set that in the settings for THAT campaign.