compare structural similarity of serveral protein sequences by CEthreader

Hi, I am currently comparing the similarity of protein contact map. I'm interested in CEthreader.
Now, I have serveral protein sequences ( in fasta format). I have read the introduction of CEthreader but I am not certain how I can get the results I need. Can anyone tell me the main steps? The result I need is the similarities between any pairs of the input fasta.

Thank you very much!