QB Issue Resolution:

Windows only from within QB. You may be able, with some work, to do this through Preview. However I suspect you’ll have to print twice, once for the data and again for the signature.

Resolution for Issue 'how to add signature in quickbook 2014 in mac version?' available: Yes (Solved).
Source: Intuit Community forum.

how to add signature in quickbook 2014 in mac version?: 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.

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