Hey there. Having trouble with plugins and themes installing. Installation is failing

Hi there. Hope I can get some walk-through on this. There are several themes and plugins that are not installing. I guess I am doing something wrong. The first time I downloaded it, I went to my admin and selected “add new” in plugins. I selected the download file, clicked install, and I get the message “installation failed”. I went on to wpmudev for this specific plugin and followed the instructions step by step, but something is not working.

Maybe it has to do with my ftp? I used filezilla b4 migrating over to wpmu. I guess I don’t what to change the ftp port to? I am so confused