Hi
1) You need to copy 'sqlite3.dll' into the directory where Lazarus itself is
located. So that it can find it when Lazarus starts.
2) You need to copy 'sqlite3.dll' into the directory where the project you're
developing is residing and to be safe copy the library with your application
when you distribute it. *)
*) Every application you develop with SQLite3 as backend, as it is now a
dependency of your project.
...or
You need to copy 'sqlite3.dll' into the windows system directory, so that it's accessible to all apps on your system. This you also have to make sure on your client's computer, when you distribute it.
As always with libraries (dlls), beware of versions!
Regards Benny
eta: paweld beat me to it...
