You can add catalog user by clicking on Step 4 (Add Catalog Users) on Product and Categories page or navigate to link (Users -> Catalog Users) in left menu bar. Here Click on 'Add New User'. Fill the email id for the user to whom you want to give the access, select the options where the user can access the catalog like Web or Mobile, you can select both as well if the user needs an access on both the platform and then save. The user will be added and a password will be generated for that user and will be sent to his/her email id. You can also restrict the user to see particular categories and sub-categories of your catalog by using User group which is explained in User settings.

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