In the PDB Database tab you are able to generate and edit your own protein database, which you can use to build your membrane.
You can add a pdb file from the default file directory /Files by right-clicking on the root of the PDB tree and choose Add PDB or delete a protein of your database by right-clicking on the pdb node and choose delete.
Besides you can change the name of your protein database by clicking on the root and choosing Rename Database.
Further you have the possibility to
At the bottom of the tab you can see a field for searching for a special protein in the database tree.
After you have added some proteins into the tree, you are able to create your membrane model tree.