Need help to launch Singular

I have recently installed Singular in Mac. To launch Singular I need to type open -a Singular in the terminal window. Then Singular opens in a new terminal window. If I just type Singular, it says that -bash: Singular: command not found.
I want to open Singular in the same terminal window just by typing Singular.
Please tell me what to do.

If I type M2 in terminal, Macaulay 2 opens. I want Singular to do the same.

Type
> nano ~/.bash_profile
and add a line
alias Singular=“open -a Singular”