STEPS :

1. Specify The Number Of Nodes, General Element Properties And Width Of The Beam.
   
2. Now Set Individual Node And Element Properties Appropriately By Selecting The Node Or Element By Clicking On It.
   
3. To Remove A Node Constraint Enter "null" Against It.
   
4. Click The "Show Results" Button To Get The Displacements And Reactions. Select Any Node To Get Its Displacement And Reactions.
   
5. You Can Keep Changing The Prioperties And Boundary Conditions And Get Corresponding Results.