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Adding Self Signed Certificates

Via GUI

1. Open the ASDM and Navigate to the Configuration Button>Click Remote Access VPN (At the bottom)>Drop down Certificate Management>Click Identify Certificates 
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2. In the right Pane, click on the Add Button 
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3. Name the certificate, Check the "Add a new identity certificate" radial, Add check marks 
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4. Afterwards, Navigate to Device Management>Advanced>SSL Settings 
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5. From here, remove any Active Algorithms that you do not want, choose the outside interface that you will access the VPN through and click Edit, choose the self-signed certificate in the drop down list for Primary Enrolled Certificate and click OK. 
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6. Apply & Save