How Can I Set Myself Invisible To All Aspects Of Zoosk?

I'm regularly on the site, but adamantly want to avoid showing up as "online".  I've chosen the "invisible" option, but quickly realized that choice is mute.   Nonnegotiable for me, I must remain invisible even while on the site.  I'll respond to any & all (on my own time) but severely uncomfortable with the disclosure to all that I am "online".  Don't want to pop up to others immediately after opening the site. Help, please!