You can carry out this task manually through phpMyAdmin or by accessing MySQL via SSH. However, it is essential to understand the proper procedures, as incorrect actions could potentially break the entire site. It is strongly recommended to create a backup of the site beforehand. Furthermore, if you wish to learn and experiment, consider setting up a development version of the site to test any modifications before implementing them on the live site. If you cannot uninstall normally, it means the installation was done incorrectly.