This is what JabRef looks like when you open it
This button will let you create a new BibTeX database. Here you can put a group of entries.
This button will let you create new entries in your database. The first box lets you choose a template to manually enter a publication and the second box uses any sort of identifier to auto-fill the entry
This is what it looks like when you e.g. enter a publication using a template
This is what it looks like when you e.g. enter a publication using an ISBN
To easily delete an entry just click the trash button