How do I make a chart with a time frame of one month. Thx.

Under chart attributes just select the "one month" option, this gives you a rolling one month time frame.

If you want a specific month in the past just select "start/end date" in the same drop down menu.

Here's a couple of links to chart examples.

http://stockcharts.com/h-sc/ui?s=SPY&p=D&yr=0&mn=1&dy=0&id=p76357270126

http://stockcharts.com/h-sc/ui?s=SPY&p=D&st=2017-03-01&en=2017-03-31&id=p06663552546