Patience for the numpty , please :-)

[Subject]That's what it says on the tag. Been in my newly sorted garden,
for a few weeks now..no destructions with it, but afaik, it was planted
proper-like, the planter said he had added slow release
fertiliser..sorry, no idea what but he seemed to know what he was
doing.. According to what I have read and Googled, it is supposed to be
variegated and , indeed it does/did look quite pretty. Have watered the
ground under and round about it thoroughly a couple of times a week
since it arrived.
Now, some of the leaves are going very pale and have brown spots on
them..
have I watered too much? ..too little ?..is it about to shuffle off its
mortal coil? Is there a site where I can go and look up about poorly
plants? I tried Googling with the name and even tried searching within
the results for brown spots..to no avail.

Suddenly pcs seem so very simple! Is it possible to reformat this plant?
:-)

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Ticketty᧧