[Tex/LaTex] How to do shell escape

Question

I read the answers and I'm not getting it. Some of them tell me to use preferences, others tell me to input

%!TEX option = --shell-escape

at the start.

Here's what my screen looks like, to show you that Idk where the Preferences tab is.

Basically want to convert that pic to png.

For efficiency in providing solutions, I'll provide the code in case there may be anything wrong with it:

\documentclass[convert=true]{standalone}

\usepackage{amsmath, amssymb}

\begin{document}
\(\{P,Q\}\vdash R \)
\end{document}

It would be a great help to fix this. Thanks.

EDIT. Here's the result after adding the –enable-18 as requested.

Answer 1

Here's a quick answer utilizing this post (following picture comes from it):

You can just add --enable-write18 (or --shell-escape respectively) to your pdflatex command.