To change the settings for the ticker on your account click on your account name in the upper right hand corner of the screen and select Appearance from the drop down menu.
This will bring up the Appearance page which has several options on it. The first two apply to the ticker.
If you do not want the ticker visible click "Hide" next to the Ticker Visibility option. It can be turned back on at any time by clicking on "Show" in the same area.
There are several options for adjusting the speed at which the ticker moves. The speed can be set to levels 1 - 9. Clicking on the dot on the slider will allow you to adjust the speed up or down. Clicking on the words below the slider will move the slider to the corresponding speed. Clicking on Slow will set the speed to 1, Normal sets the speed to 5, and Fast sets the speed to 9. If you wish to, clicking on the turtle icon will slow the speed by one while clicking on the rabbit will increase it.
If you are interested in changing the pairs that are displayed on the ticker, please refer to the article on how to do so here.