Modifying a paint.net plugin source and recompiling it?

I'm trying to create a slightly modified version of an existing plugin for the program paint.net. The creator of said plugin released the source code on GitHub, in particular the effect.cs file containing the actual plugin program. I just need to change one of the values but then I don't know how to 'recompile' it into the .dll extension I need to use the plugin. I have no experience with sw development and I never used C#. Can anybody help me?