My Docker knowledge is very poor, I have Docker installed only because I would use freqtrade, so I followed this simple HOWTO

https://www.freqtrade.io/en/stable/docker_quickstart/

Now , all freqtrade commands run using docker , for example this

D:\ft_userdata\user_data>docker-compose run --rm freqtrade backtesting --config user_data/cryptofrog.config.json --datadir user_data/data/binance --export trades --stake-amount 70 --strategy CryptoFrog -i 5m

Well , I started to have problems when I would had try this strategy https://github.com/froggleston/cryptofrog-strategies for freqtrade . This strategy requires Python module finta . I understood that the Python module finta should be installed in my Docker container and NOT in my Windows system (it was easy "pip install finta" from console!).

Even if I tried to find a solution over stackoverflow and google, I do no understand how to do this step (install finta python module in freqtrade container). after several hours I am really lost.

Someone can explain me in easy steps how to do this ?

Freqtrade mount point is D:\ft_userdata\user_data