The PeCoP page is divided into three sections: the sequence input section, the PSI-BLAST parameter setting section, and the PeCoP parameter section. Basically, you either paste or upload your sequence in the sequence input section, set PSI-BLAST parameters in the next section, and then set the PeCoP parameters in the third section, and submit your query. Note that query processing might take a while, even when the server is not loaded. This is the result of running several PSI-BLAST iterations.