I am unable to select anything within the highlighted field wanted to know why
Request type comes from the customer (or agent acting for a customer) creating the request (not the issue) in a portal.
The issue you've got here was created in the back end, not from a portal, so it has no request type, or interface to the customers.
So how do I make the changes to it now
for future how to get this fixed if client raises an issue via an email and not the portal
You can't - there's more than just a request type attached and you don't enter that.
Via email, you have to set a default request type for emails - see https://support.atlassian.com/jira-service-desk-cloud/docs/choose-a-request-type-for-email-requests/
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