You can manage email signatures in Google Workspace using the following steps:

1. Sign in to the Google Admin Console using your administrator account credentials.
2. Click on the "Apps" icon and then select "Google Workspace" from the list of apps.
3. In the Google Workspace dashboard, click on the "Gmail" icon.
4. Click on "Settings" and then select "General" from the list of options.
5. Scroll down to the "Signature" section and click the "Create new" button to create a new signature or click on an existing signature to edit it.
6. In the signature editor, you can add and format text, images, and links to create a customized signature for your organization's email.
7. You can also use the options under the "Insert image" button to upload an image from your computer, select an image from your Google Drive, or add an image by URL.
8. Once you have created or edited your signature, click "Save changes" to apply the changes.
9. To assign the signature to specific users, go back to the "General" settings and scroll down to the "Default routing" section. Here, you can select the users or groups to whom you want to assign the signature.
10. Click "Save changes" to apply the changes.

By managing email signatures in Google Workspace, you can ensure that all outgoing emails from your organization have a consistent and professional look, and include relevant contact information and branding.