1. From Setup, either:Enter Permission Sets in the Quick Find box, then select Permission Sets, orEnter Profiles in the Quick Find box, then select Profiles
2. Enter Permission Sets in the Quick Find box, then select Permission Sets, or
3. Enter Profiles in the Quick Find box, then select Profiles
4. Select a permission set or profile.
5. Depending on which interface you're using, do one of the following:Permission sets or enhanced profile user interface—In the Find Settings... box, enter the name of the object and select it from the list. Click Edit, then scroll to the Object Permissions section.Original profile user interface—Click Edit, then scroll to the Standard Object Permissions, Custom Object Permissions, or External Object Permissions section.
6. Permission sets or enhanced profile user interface—In the Find Settings... box, enter the name of the object and select it from the list. Click Edit, then scroll to the Object Permissions section.
7. Original profile user interface—Click Edit, then scroll to the Standard Object Permissions, Custom Object Permissions, or External Object Permissions section.
8. Specify the object permissions.
9. Click Save.