The US District Court for the District of New Hampshire offers ECF users interactive computer-based training modules. The court also provides access to the PACER Training website.

US District Court - District of New Hampshire's Computer-Based Training Modules
Interactive training modules that exactly replicate the USDCNH ECF Filing System.

Public Access to Court Electronic Records (PACER) and Electronic Case Filing (ECF) Help
Find resources for using PACER and CM/ECF and get answers to your frequently asked questions.