Permissions can be changed and assigned by navigation to Configuration\Users Access & Roles. You can also go through this knowledgebase article for more information about the permissions: https://www.lansweeper.com/kb/102/restricting-access-to-the-web-console.html
The minimum permissions, which is to only have 'Access Asset Management' (by default this is in the 'View Assets' role) allows a user to view assets and (asset) reports plus what any user can do without any permissions (create tickets etc.)