How To Use Visio Step By Step :

Follow below steps :

Step 1: Choose blank drawing/ in 2010 virsion select 1st which is at start of Visio.

Step 2: Always use US unit and tap on Create/ in older version this will not display but in next step it will ask for it so choose US unit

 Step 3: tap on More Shapes.

 Step 4: Now you have to find which diagram you want to draw.

Next Step: Select shape an DRAG into white page. 

Next Step : If you want to Type anything in that shape Just tap on TEXT.