I'll give it a shot.. if you are trying to attach a pdf to the return for form 1116:

• Make sure you have the return to be efiled
• Go to EF Homebase
• Highlight the row labeled "Federal Return" under REturn Type
• On tool bar on top of your window, click on paper picture of paper clip
• Add attachment
• Navigate to that attachment (the pdf) on your computer
• Double click on that pdf
• Under Type columnm, click on drop down, choose Other
• Type in a description in that column
• Click OK