Your profile holds all your information and updating it is really simple.
Hit the settings cog in the menu bar and use the menu that pops up to select Edit Profile. In the Blink mobile apps, the settings cog can be found bottom-right of the navigation bar.
This opens your profile, fill in anything that's missing and you're good to go. Only people you're connected to can see your full information.
In Edit Profile, you can choose to hide your contact details which means that nobody on the platform will be able to see your mobile number and email. This is useful if you have signed up with a personal email address and joined a work team.