Popular trading tools have only the most popular time frames like M1, M5, M15...D1, W1, MN.
Each of them groups data into blocks of a fixed size. For example, H4 limits data you see by 4-hour blocks. You see just opening, closing, highest and lowest values for each of the bars. It enables you to see the market from a higher perspective, at the cost of losing detailed information about what happened inside of these bars.
Time frame names encode these periods into a type name char, followed by a width of the time frame.
M - minutes
H - hours
D - days
W - weeks
MN - months
You can either go with standard time frames, or add more exotic ones like M3, H2, etc. Just click the button to the right of time frames.
Select a time frame you want to add. It will be added instantly, but its charts will be built on demand, which may take up to a minite for low-level time frames.
To remove a time frame, click on its name then choose "Delete" menu item.
In addition to standard time frames, you can add exotic ones:
S - seconds
T - ticks
RANGE - Range Bars (range in pips)
RENKO - Renko Bars (range in pips)
Tick-based time frames, including Range/Renko Bars use non-linear time. When we are talking about M1, it means that each and every bar is exactly 1 minute long. But, when you look at 100-tick bar, you should notice that it may take from few seconds on a fast market to several minutes on a sloppy market to generate the bar.