When you sign into the portal you will want to select the mSign product on the left. It will be the orange icon.
From here you want to make sure Documents are selected. Then select the Create button on the top right.
After selecting create you are asked to choose between Just me and Me and others. If you would like to create the document for you and others to sign select Me and others.
From here you will be asked to upload your document. You can choose to upload from your device or from the cloud. You can also choose a saved template.
Once you have your document selected you will select the Next button. You have now created a document for you and others.