One of the limitations of the new e-filing system is the inability to add a third party that is not listed in the Filed By drop down. The court is currently working on a solution for this, and hope to have it out soon.
In the meantime, they request the filer contact the court to have the party added. We know how difficult that can be, and think we can provide two options:
1) Contact the court to add the party
2) Select any party, then type a note to clerk at the bottom of the filing.