QB Issue Resolution:

If you’re unable to enter the amount or hours when creating invoices, then this has been an ongoing issue for customers who are using Safari. What we’ll have to do is update the Safari browser to its latest release, or use a different browser, such as Internet Explorer or Google Chrome.

If you’re still unable to create the invoices, please let us know so we can report this to our back end team. Just leave a comment and we’ll get back to you with a fix/additional steps.

Resolution for Issue 'I can not type in the amount box' available: Yes (Solved).
Source: Intuit Community forum.

I can not type in the amount box: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for amount box
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Error Recovery for amount box [Canada]
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