If you want to use for example your own M13F primer, you have two choices. Either you do not enter primer information in the order form and only add it to your template (StandardSeq and RapidSeq protocols), or you specify this primer in My Primers and consequently in the order form using a different name than M13F. Please notice that if you choose M13F in the order form (= our universal primer name), we always add it to your template!