where to get editable ETA750B form, pdf file or any other file

would anyone also please tell me how to save the I140 and ETA750B file after filing personal informa

The i140 file (pdf) I downloaded can only be printed out after I input my personal information, but can not be saved. For ETA750B form, it is only readable, and printable, but I can not even file anything into the electric form, only typing with typewriter. Would anybody tell me some better way to work out?
thanks a lot
letufly1028@yahoo.com
 
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