This question a) belongs on meta, not here & b) is rather confused. What does the Alt key have to do with your requiring two backticks ` [not tildes, btw, they're ~ ]

Stack Exchange uses markdown for formatting, which means two backticks surround a code block like this. This is entered as

`a code block like this`

If you want to enter any markdown & not show as such, then you can escape formatting marks using backslash \

So if you want `two backticks without formatting` you type

\`two backticks without formatting\`

This & much more formatting help is available from within the text space, right above where you type your question or answer.

This question is rather confused. What does the Alt key have to do with your requiring two backticks ` [not tildes, btw, they're ~ ]

Stack Exchange uses markdown for formatting, which means two backticks surround a code block like this. This is entered as

`a code block like this`

If you want to enter any markdown & not show as such, then you can escape formatting marks using backslash \

So if you want `two backticks without formatting` you type

\`two backticks without formatting\`

This & much more formatting help is available from within the text space, right above where you type your question or answer.