You can make an alert in javascript by using the following code:
Hi @xX_FlameGamer_Xx - welcome!!
It looks like the forum interpreted your code as HTML and so didn’t show it.
Try putting your code between backticks like `this`.
Alternatively, you can sandwhich your code between two sets of three backtics in a row, like this:
```
your code here
```
That way, you can be sure that the code in your post will be visible to others, like this:
<script>alert('alert');</script>