how can i get multiple EMA`s on chart?..
It would be easier if you told which charting interface you are doing.
Its quiet simple to plot multiple EMA’s. You’ll have to right click on the chart --> Select Add Indicator --> Select EMA —> Define the time interval.
Why chart are you talking about?
In google finance, you can add EMA’s under technicals, Select one by one and then add by changing the period to 10 days, 28 days etc