How to link solder to an existing modpack?

[andyilpro]

As the title, I read that if modpack slug is the same you can do it, but what is exactly modpack slug?

[plowmanplow]

This is a Technic custom modpack API URL:

http://www.technicpack.net/api/modpack/jclite

For this pack, the Slug is "jclite". This is what needs to match up in order to link an existing pack through Solder.