The time and frequency need to be set correctly to output the arbitrary signal from the function generator with the wanted frequency. 

On the image below you can see that the frequency is set to 100Hz and the signal should go from 0-10V in 10 seconds. 

With the current settings, the signal will go from 0-2V 100 times per second. 

To get the signal that goes 0-10V in 10 seconds, you need to adjust the frequency to 0,1Hz and the scaling to "Direct".

Frequency = 1 / max time in arbitrary 

0,1Hz = 1/10s