Simple membership plugin has a feature that lets you add a mini login widget anywhere on your site. This can be useful to add a mini/compact login widget to the sidebar of your site.
Below is an example of how this mini login widget looks like to the users who are not logged in:
When the users are logged into the site, it looks like the following to them:
Creating the Mini Login Widget
Add the following shortcode where you want to use this widget:
Adding to the Sidebar
1) Add a text widget to your sidebar (where you want to show the mini login widget).
2) Use the following shortcode in the text widget:
3) Save the widget.