To install follow please Salesforce help article
- After install assign Asset Admin permission set to users, who will manage assets:
Assign Permission Sets to a Single User
Assign permission sets or remove permission set assignments for a single user from the user detail page.
- From Setup, in the Quick Find box, enter Users, and then select Users.
- Select a user.
- In the Permission Set Assignments related list, click Edit Assignments.
- To assign a permission set, select Asset Admin under Available Permission Sets and click Add. To remove a permission set assignment, select it under Enabled Permission Sets and click Remove.
- Click Save.
Assign a Permission Set to Multiple Users
Assign a permission set to one or more users from any permission set page.
- From Setup, in the Quick Find box, enter Permission Sets, and then click Permission Sets.
- Select the Asset Admin permission set.
- Click Manage Assignments and then Add Assignments.
- Select the checkboxes next to the names of the users you want assigned to the permission set, and click Next.
- Click Assign.
Messages confirm success or indicate if a user doesn’t have the appropriate licenses for assignment.