Adding Frame, Script tags to TinyMCE editor
By default, Joomla will restrict you from inserting high-risk code such as IFRAME, JAVASCRIPT, STYLE into articles for security reasons.
However, it also causes trouble when you try to insert something from a third party that you trust. Such as Maps, Youtube or Charts...
This article will show you how to insert advanced codes into articles without losing them when saving. Please make sure you know what codes you are going to add.
1. First, you need to grant permissions to the user group that can use these tags.
At the admin page, go to System > Global Configuration > Text Filtering, select the user group. If you are an administrator, the group will be Super User. Select Filter Type as No Filtering.

2. Go to Extensions > Plugins > Editor - TinyMCE > Set Use Joomla Text Filter is Yes.

3. Go to the article to add code, click Toogle Editor button. Then paste the code to add and save the article.

In case you are using another editor, you should contact their developer to resolve it. Alternatively, you can also use the Custom HTML module to insert these codes.
I have been googling how to change the menu colours, as the black text on my purple background is not very readable. However everything I have tried to change the text colour of the Off-Canvas main menu text to white did not work.
Would you know what custom CSS I would need to change all menu items to white text (including submenus).
Probably need background colour to not be white when hovering over submenus
Any help you can provide would be gratefully appreciated (or a pointer to some useful help).
Thank you
see
https://siteupdate.vedicmaths.org/index.php
InPre-Update Check for Joomla 5.4.4
for Off-Canvas it says
Joomla cannot detect the extension's compatibility with the target version of Joomla.
have you implemented the compatibility stuff for Joomla to upgrade extensions correctly ?
Have got two off canvas menus working (1. for tools and 2. for main menu)
However I can only get the Main menu to display the first level of menu items.
Have you any suggestions for getting the sub menu items to display ?
N.B. the menu item with sub menu items does display a down arrow, but trying to click on it only display the item at the main menu level.
see
https://siteupdate.vedicmaths.org/index.php
If you want to see where I have currently got to
What is wrong?
That imported page keeps on saying this, but nothing further is happening...