Why do we need to Trade Using Multiple Timeframes?
To improve the efficiency of our trading strategy. We see the major Trend using a higher time frame than what we intend to use & a lower Time frame to enter a trade.
Say we want to trade using the Daily Charts. We take the Weekly charts to see the major trend. Suppose its an uptrend in a Weekly chart. We will tend to trade only long positions. We will use entries in the daily charts to enter long positions only. When sell signals are generated we will just exit our long positions. I.e. we dont short sell.
Suppose its a downtrend in a Weekly chart. We will tend to trade only short positions. We will use a entries in the daily charts to enter short positions only. When buy signals are generated we will just exit our short positions. I.e. we dont enter long positions.
Now that we are using two timeframes. Now coming to timing the entry of trades or adding additional positions. (Pyramiding) We can further use a Hourly chart to time our entries. Supposethe weekly & daily charts are in a uptrend. We will enter a long position or an additional long position when a hourly chart gives us a buy signal. Supposethe weekly & daily charts are in a downtrend. We will enter a short position or an additional short position when a hourly chart gives us a sell signal. This timeframe would not be used to exit the trades. Its solely to improve the timing for entry. For exits we would use the signals generated in the daily charts.

Using multiple time frames to trade
We take three charts of the same security. First is the weekly chart. Next chart is the daily chart. Third chart is the hourly chart.
We will now use the daily chart to trade. We check the weekly chart for the weekly trend. Lest assume the weekly trend is up. So based on this information we will just trade long positions in the daily chart.
We look for a buy opportunity in the daily chart or we can see the hourly chart to enter a long position.
Now for entering additional positions we use buy opportunities in the hourly chart. We would exit based on the daily chart only, because we were trading based on the daily chart.

Similarly we can trade short where weekly charts are in a downtrend and daily chart generates sell opportunity. Additional positions are entered whenever sell opportunities are generated on the hourly charts.

For Day trading we can use the Hourly, 15 Min and 5 Min charts here we trade the 15 Minchart. Orwe can use 15 Min, 5 Mins and 3 Mins charts herewe tradethe5 Mins chart.

Good Luck and Happy Trading.