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Click Mail in the left panel and select Compose and reply. Click the gear-like icon in the top-right corner and choose View all Outlook settings. Log into your Outlook 365 email account in your browser to open the Outlook web app. You can also add and edit a signature in Outlook 365 web app.
Read More How to Add a Signature in Outlook 365 Web App Then you can edit the signature in the pop-up window.
If you want to edit the email signature in the future, you can right-click the current signature in your email body and select Signatures. Alternatively, you can also click Signature in the toolbar and choose another signature from the dropdown menu. To change the email signature in Outlook 365, you can right-click the email signature in the email box and select another signature. To set a signature as a default in your emails, you can create a new email in Outlook, click the Signature option and choose the preferred signature that you want to apply to your email message. You can add different signatures for different email accounts. If you want to apply the signature to your emails, you can select your email account under Choose Default Signature. Then you can add and edit your signature under the Edit Signature You can add your business logo, contact name, work title, phone number, email address, etc. Click the New button to add a new email signature and give it a name that you can easily recognize. Under the Message tab, click Signatures -> Signatures. If you have the Outlook 365 app installed on your computer, you can open the Outlook app to enter into its main interface. Read More How to Add and Edit Signature in Outlook 365