Signature is one of the functions offered by Yahoo Mail for its users. With this function you do not need to bother to write the same closing greeting every time writing emails. Simply write and save the greeting and closing your identity Signature menu, then the text will then automatically appear on every email in your post.

How do I use this signature to function? Here are the steps ….

1. Make a login to Yahoo Mail with your account, then from the main page click on Options contained in the upper right and select Mail Options.
2. select the menu Signature. In the initial settings, there will be a signature function in the position Do not use a signature.
3. To start using the signature to every email you send, click the option Show a signature on all outgoing messages If you want to use a custom writing format click on Rich Text is there at the top right of writing a signature box.
4. Write Signature that you want to display on your email, then click Save Changes. Then you can return to the main page your email account by clicking the Back button to Mail.
5. Now every time you create new email ,  you will immediately find a signature that you created earlier.

beside Signature  use to show the identity of the sender of the email, this signature can be used as a promotional site, blog or your business

if you want to use image signature on your yahoo mail here is the tutorial :

1. Create your own yahoo image signature at signature maker , and generate it. sample is like this :
2. Open your yahoo mail home page, do not close signature maker page
3. Go to option > mail option, and then click the signature option.
4. now the yahoo signature setting is open, now click the radio buttom “Show a signature on all outgoing messages” , after that now click the blue text on right corner “Rich text” it will change your signature  text box to WYSIWYG editor.
5. Next step is dragg the signature image that have you generate before on signature maker result box to yahoo signature WYSIWYG text box.until you see your  image there.
6. If you want to add some text , just add it. after you finish clik save
7. Lets tray your signature now, first create new email , on the right corner of email message text box, click the “Rich box”  and refresh your browser by hit F5, now your image  appear  everytime you create new message.