Demo account questions

 

How do i add more funds to my demo account

How do i change my lot/volume? 

 
What broker?
 
You have to login to your brokers website and do it from there.
 
PengVang:

How do i add more funds to my demo account

How do i change my lot/volume? 

You can open the other demo account (you can not add more funds to demo because no any funds in demo).

Change lot size?
You can open new order:
New order (or F9) and select the lot size (Volume).