Hey,
But the card that comes up shows odd forecasts. It’s for the next few hours instead of few days. Where is the configuration to change this? show to all days.
- platform: wunderground
api_key: 20eff3b6ee3
mode: daily
monitored_conditions:
- weather
- temp_c
- feelslike_c
- wind_mph
- relative_humidity
- pressure_mb

You have a weather underground sensor defined and a dark sky weather platform defined. Your frontend card is using the dark sky weather platform. Note that there is no weather platform for weather underground. Also, if this is your api_key consider asking a mod for help cleaning your post.
This is not my Api 
so what you offer me in order to resolve it?
Change your dark sky weather config to use daily, but it won’t be the weather from weather underground. If you are using the sensor from weather underground, there is no default ui card you can use, since it isn’t a weather platform. There are some community built cards you can search for though.
Sorry im still not get how to resolve this issue,
i chnage my config to
- type: weather-forecast
entity: weather.home
mode: daily
but still i got same day only .

Don’t put the mode in the ui config, but in the configuration.yaml under your darksky weather platform. I’m surprised there is no error with the mode in the ui config.
now i just habe on my configuration.yaml
- platform: wunderground
api_key: 20effb6ee3
mode: daily
monitored_conditions:
- weather
- temp_c
- feelslike_c
- wind_mph
- relative_humidity
- pressure_mb
But still show the same.
You placed it in the weatherunderground sensor platform, see above for what you need to do.