Using Elements, you can document the users who are stakeholders for a particular metadata component in either your Salesforce metadata dictionary or generic system metadata dictionary.

To add a stakeholder, navigate to the right panel in your metadata dictionary. From the first tab, click "Add stakeholder".

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This will open a window allowing you to search for the user you want to add as a stakeholder. You can only add users who are currently a member of the Space - as you type their name or email in, they should show in the dropdown.
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Here you can also select which role they have as a stakeholder, and leave a descriptive comment on the nature of this role.
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You can add up to 20 stakeholders on any given component.

You can easily edit a stakeholder by clicking it in the right panel. This will open a window where you can change the stakeholder, their role, and the comment:

There are 4 stakeholder roles that you can assign to a user:

You can only add a user once, and assign one role to them. However, you can add up to 20 stakeholders, and there can be multiple users with the same role. For example, below you can see there are 2 users who are "Owners" of the Account object, and one user who is the "Authorizer":

To remove stakeholders, simply click the cross next to the stakeholder's name. This applies to both Org and Reference models.

This action cannot be undone. If a user is removed from the Space or Reference model, they will be removed as a stakeholder.

The "My Metadata" view shows you all the metadata you are a stakeholder on. This view allows you to narrow down and only see metadata relevant to you. From this view, you can still access the right panel and carry out the same actions as usual.

To switch from the "Metadata Dictionary" to "My Metadata" view, select it from the dropdown list above the model: