It's pretty simple, just follow the instructions provided at the second link (here).
- You need Mono and Latex, so run this command:
sudo apt-get install mono-complete texlive-full
- Then download the file provided at that page (TikzEdt_2_1_Linux.tar.gz)
- Copy/paste the downloaded file to the location where you want to run it from
tar -xf TikzEdt_2_1_Linux.tar.gzin the same folder as the downloaded file
- Once it's finished extracting, run
You should be good to go!