Note: Make sure you use Google Chrome or Mozilla Firefox during installation.
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​Next, please watch our installation video guide for Yahoo shared below:
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Or take these steps:

Step 1.
After creating your email signature, click Save signature button under the signature preview.

Or, if you have saved your signature, find your signature on the Dashboard and click Install button.
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​Step 2.
​Select the Yahoo icon in the list of email clients, then click Copy to clipboard button.
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​Step 3.
Open Yahoo and go to Settings > More Settings.
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​Step 4.
​Choose Writing Email in the left menu and turn the signature ON.
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​Step 5.
Paste the signature into the edit box (Ctrl + V (on Windows PC) or Command + V (on Mac)) and go back to your Inbox.
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​Step 6.
Compose a new message, then click Send to see and test your unique email signature.

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Congratulations! Starting from this moment, you will see your new signature in every email you send to Yahoo.