Navigate to Wallets.
Select the wallet and navigate to the Settings of the selected wallet.
Click Advanced options and navigate to the Access rights field.
Type the user email in the Invite new user field.
Click Invite to invite the user. The user will receive an email invitation with a link to activate an access to the wallet.
A new user is added by default with a Read only role that can be changed immediately.
Refer to Account security for more details.