Cant access /view Issue through customer portal

[Prasanna]

Hi Team

I am using Service Desk 3.14.1 and running with issues.

1. How can i access / view all issues created by team members on Customer portal

2. Only few members having the "jira-Agent" license and they can access

3. How non-agents provide access to view on portal 

4. How non-agent license users are not listing in "Assignee" filed value.

5. How can i edit the default queries on customer portal ( so that can i add few columns)

Kindly assist me resolve these gaps