I think that you mean
$$If $sin\theta = 0.588 \qquad $ then how do I find the angle $\theta$\\$$
When you are looking for an angle you have to use inverse sine (arc sine is the same thing)
So on the web2 site calc (on the home page) just type in
asin(0.588) and that will give you the acute angle answer - which is probably the answer that you want.
(there are other answers as well but don't worry about those unless you have to)
I think that you mean
$$If $sin\theta = 0.588 \qquad $ then how do I find the angle $\theta$\\$$
When you are looking for an angle you have to use inverse sine (arc sine is the same thing)
So on the web2 site calc (on the home page) just type in
asin(0.588) and that will give you the acute angle answer - which is probably the answer that you want.
(there are other answers as well but don't worry about those unless you have to)