Setting up Nicaraguan for Taxes in QuickBooks Online (QBO) is unavailable. In your case, you'll want to select from the list of commonly-used (VAT/GST/GCT/IVA/ITBIS/TOT) rates. However, we highly recommend consulting your own tax or accounting advisors regarding the applicability of these rates.
You can check these articles for additional information about the Sales Taxes feature.