User Security And Permission Settings
1. The User Security And Permission settings step appears as shown below:

2.

Select any one of the following options given below:

Do not migrate permissions -Do not migrate user memberships and role assignments. 

Migrate permissions for uniquely secured items from source - Migrate user memberships and role assignments such as out of the box roles like Web Designer, plus any custom roles that extend from the out of the box roles. 

3.

Click Click Next to proceed.