The save button is not showing so I cannot save a transaction. What has happened? Please help.

Hello there, @CAPITALBASE LIMITED.

I got few steps to help you save your transactions in QuickBooks Online. To start, let's access your QBO account using incognito mode. Private mode prevents storing cache and cookies that might cause problems when running websites. Here are the shortcut keys you can use:

• Google Chrome: press Ctrl + Shift + N 
• Mozilla Firefox and Microsoft Edge: press Ctrl + Shift + P
• Safari: press Command + Shift + N

Once signed in, go to the +New icon and choose the transaction you'll need to create. When finished entering the details, see if you can find the Save button. 

If this works, go back to your regular browser and clear the cache. This will remove the stored cache or cookies to refresh your browser. If the same thing happens, use another supported browser. It could be that the one you're currently using has a temporary issue with QuickBooks. 

Also, just in case you want to import transactions from your bank to QBO, here's a helpful article that you can follow: Manually upload transactions into QuickBooks Online. 

Feel free to post here again if you have further concerns about saving your transactions in QuickBooks. I'm always here to help. Have a good one.