Carmona bonsai

, i have bought a Carmona bonsai a few weeks ago and the leaves keep going yellow I brought feed for it off Amazon specifically for Bonsai it just needs some tips and help as I am making sure about the soil is never dry and not over watered I'm feeding it once a week and I'm still unsure whether it needs a few hours of direct sunlight every day but I am under the impression that it does need a lot of light I also missed it every day as well 

Hi! Please share some photos and add more details on where you placed it, so we can help.

Please see below it is placed on my windowsill during the day and I move it into my room at night i am also using tesco natural mineral water to water it as I learned that they don't like hard water I have also attached a photo of the feed that I brought for it 

I cannot see any picture of the tree.

Where did you find the information about hardness in tesco mineral water?