You must include it in a modpack in order to use it with CurseForge. Click the three dots next to the Play button in the Curseforge launcher after selecting the modpack you want to add it to under the My Modpacks page. Select the Open Folder option from the drop-down menu. Put the modpack-supported version of the mod into the mods folder. That's it; the Curseforge launcher can now be used with OF.