@gbpsports
It is not currently possible to manually add a review from the backend. Since it is showing the review as “read-only” I would deduce that you are attempting to add a review in a non-standard way?
Generally, reviews added using the Site Reviews submission form ARE editable (the title and review text), and there is also a “Revert” button provided to revert an edited review to the original.
The reason it is showing as “read-only” is because reviews MUST have the review_type meta_key with a value of “local”. This tells Site Reviews that it is a locally submitted review and can be edited by the administrator. This meta_key is in preparation for the upcoming Tripadvisor add-on that will be released in v3. Reviews that have been synced from third-party sites (such as Tripadvisor) will be read-only.
If you need a solution to programatically add reviews, please let me know and I will help to point you in the right direction for a solution.
