Critical z value problem

Need help with this problem

Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis. Significance level = 0.08 and H1 is u is not equal to 3.24.

Based on the significance level I came up with an area of 0.04. After trying to find the area, I am not sure what to do next. Someone please help me with this problem. Thank You.