Download PDB from PDBTM database: proteins in PDBTM are already transformed into membrane coordinates and have corrected oligomeric state - recommended
Download PDBID from OPM database: proteins in OPM are already transformed into membrane coordinates and have corrected oligomeric state; be aware that OPM also contains peripheral membrane proteins that aren't handled by the method
Upload custom PDB file - not recommended - Requires structure to be (1) an integral membrane protein, (2) transformed into membrane coordinates (TMDET or PPM), and (3) with correct oligomeric state!!!