How do I transfer my plugin data?

Data should be stored on the DB, so your plugin should be saving all those QA on a table, so should be able to export that table and then you will have to know how the new plugin storages its data (which table and how) and you import there.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)