ChessBase 12

I have chessbase 12 and mega database and engines 

but i don't know how to attach them to chessbase 

I have Chessbase 11, so it's probably the same thing.

To add engines, click the Create UCI Engine link at the top, from the HOME tab.  Select the exe file by navigating to the folder it's located in, on your hard drive.  After adding it, click the Parameter button to change any of the default engine parameters.

When you first open the program, you can open a database simply by clicking on the HOME and then OPEN icons.  Select the database you wish to open.  Again, navigate to where it is on your hard drive.  You can open a pgn database or a chessbase format database.

thx for help it worked 

i have some engines but they are  *.eng

how to add it?