How to change signature in Outlook

Open browser version of outlook, not desktop.

Create signature for New emails

1) Copy the first template for New emails

2) Open Settings > Compose and reply;

3) Create a signature and call it "New", paste the template.

Done, hit save.

Create signature for Replies

1) Copy the second template for Replies

2) Open Settings > Compose and reply;

3) Create a signature and call it "Reply", paste the template and EDIT it.

Done, hit save.

IMPORTANT STEP

Now that you created two templates, make sure you select New for new emails and Reply for replies. Save one more time and you are done!