FAQ's (These may be helpful AFTER installation): https://dynasend.com/pages/email-signature-user-faqs.html
PART 1 - DOWNLOAD THE ZIP FILE THAT CONTAINS YOUR SIGNATURE FILES
Enter the email address you used to create your signature:     

You should see your download dialog box (similar to this) - choose "SAVE" or "SAVE FILE" and click OK.


PART 2 - COPYING YOUR SIGNATURE FILES
Navigate to the folder where you just saved the signature ZIP file - most likely this will be your "Downloads" folder.

Double click on the "signtures.zip" folder to open it.
You'll now see a folder that is named (virtually) the same as your email address - drag it to your desktop (you can delete it after the installation is finished).
From your desktop, double click the folder to open it.
You'll now see one or more files named "signature" - press your "Ctrl" key and your "A" key at the same time - Ctrl-A - to "select-all"
All the files will now be highlighted in blue - press your "Ctrl" key and your "C" key at the same time - Ctrl-C - to copy them.

PART 3 - COMPLETING THE INSTALLATION INTO OUTLOOK
Step 1. Now go into Outlook and navigate ALMOST all the way to your email signature dialog by doing the following:

Outlook 2003 or Outlook 2007

- from your inbox, click TOOLS at the top
- pull down to OPTIONS
- click the MAIL FORMAT tab

Outlook 2010 or 2013

- from your inbox, click FILE in the upper left corner
- pull down to OPTIONS
- click MAIL in the left column

At this point you'll see the "Signatures" button - HOLD YOUR "CTRL" KEY DOWN AND CLICK THE BUTTON AT THE SAME TIME.
The folder that stores your signature files will open.

Step 2. Press "Ctrl-V" or RIGHT click and choose PASTE to paste your signature file(s) into this folder.

Note: If you are told that you already have a file with the name "signature" in the folder then overwrite the old file by chosing to "COPY and REPLACE" the existing file(s).

Step 3. Close the signatures folder, and this time just click the "Signatures" button:
Step 4. You'll now see the signature you just saved in your list of existing signatures. Set this signature as your default signature for new messages and for replies, save your settings and exit the signature dialog.
You're now finished installing your signature.