Drag and drop

Changed my mind. I am new at this computer and your program and drag and drop is new...please tell me how step by step ..so that I have everything open that should be open and now put it where it shouldn't be. Thanks so much

I will assume you created a mailing list in the address book where your contacts are. Open the address book window. Your address books will be displayed in the pane on the left. If the mailing list folder is not showing under the address book you created in click the small pointer beside the address book folder. Now both the folder for the address book and the folder for the mailing list will be showing. Select the address book where you created the mailing list. Now all the contacts for that book will show in the main window. Pick your contact, left click and hold it, drag it to the mailing list folder and release the mouse button.

The instructions I provided when you asked about groups covers all this. https://support.mozilla.org/en-US/kb/how-create-and-use-mailing-lists-thunderbird

Yes Yes thank you ..it worked.