Kelu cannot index past Freshdesk tickets as a knowledge source. The ticket source under Add source reads Zendesk only. Here is what you can do with Freshdesk:

Answer incoming tickets

Connect Freshdesk with its domain and an agent’s API key, ideally a dedicated agent’s: replies are posted under that agent’s name. Kelu checks for new tickets every minute and answers, drafts or tags the ones in the Freshdesk groups you pick, from your knowledge base.

Index your help articles

If your Freshdesk knowledge base is public, add it as a Website source.