Synaptic is the default GUI-based package manager in Mint. You do not need to install it.
If you are using Synaptic, then enter the package name in the search box and press Enter. Right click on the leftmost box and select 'Mark for removal'. To completely remove the package including it's config files, select 'Mark for complete removal'. Press the 'Apply button' to perform the task you selected.
If you want to do it from the CLI:
To remove a package but keep it's config files:
sudo apt-get remove PACKAGENAME
To remove a package including it's config files:
sudo apt-get purge PACKAGENAME
If you want to remove/purge a specific version of a package:
sudo apt-get remove|purge PACKAGENAME=version
If for some reason the removal left orphaned files, use:
sudo apt-get autoremove
to remove them and recover the disk space.