If you obtained the file directly from the web using the options in Jmol top menu (Get PDB or Get MOL), then you should save a copy to you local disk or hard disk. For these, use the pop-up menu File > Save a copy of file. That will just save the model data but then you can work on it.
Another choice is to save from Jmol both the model data and the current orientation, rendering, color, etc. For that, you use the pop-up menu and File > Save all as JMOL file (read more below).
If you are at the PDB website, there is a link (top-right) to download the file; you can choose either pdb or pdb.gz options (the last is a compressed format that will take less time to download, smaller file).
If you are at the PubChem website, there is a link-button (top-right) for downloading; choose the 3D SDF option.
Take these 2 files with you and you can display it in any place, without the need for any software being installed other than Java:
It produces a webpage with the models as displayed in Jmol. Then you just need to edit the page to add titles, text...