User -> Profile -> Add Custom Radius Attributes

Number Attribute Description
1 Attribute Name Insert radius attribute name here, don't insert any random name or text here if you don't know exactly what to insert here. Be 100% sure what you are doing and about the attribute which you are going to insert. User may not able to login for the reason of any faulty attribute config.
2 Attribute OP Most of the time := or ==, read radius or router documentation for more info.
3 Attribute Value Insert attribute value here, read radius and router documentation for more info.
4 Type Attribute reply or check, select proper type.