Keyword Lists Screen

In the keywords screen you enter collections of keywords that you will use to create doorway pages. Keep the collections similar to each other. When you generate doorway pages,  choose the collection of keywords that you want the web pages to be optimized for and generate the pages 

1- Keyword List: These are names of keyword collections that you want to use. Each collection may contain as many keywords as you want. The keywords are consequently used to generate the doorway pages.

2- The Keywords: Simply press on the * (star) on the left side of the table and a new entry is made on the keyword list. To remove, click on the left box next to the keyword (which select it) and press the delete key.

While entering, first enter the keyword, press Enter to finish the entry and then press Up-Arrow or Down-Arrow to continue. 

Try to group keywords by category to make things easier. Hence when you create a group of doorway pages, you have a fairly focused set of keywords in the collection.