I werent to a store this weekend.

I found many dishes that awere convenient and easy to use.

My dishes' weight are heavy.

so, iIt's difficult for me to put in a dishes machine.washer. So I decided to change mybuy new dishes.

I am looking forward tohope it wil be successful.

I werent to a store this weekend.

(you/we/they) were: to be (past tense)
(I/you/he/she/we/they) went: to go (past tense)

I found many dishplates that awere convenient and easy to use.

We're speaking in the past tense, so "were" instead of "are"

I think you're talking about buying new plates. "Plate" is a more typical word for what you eat your food off. "Dish" also works, but is now usually used to mean the food itself. E.g. "the chef cooked a dish of fish and potatoes".

My dishplates' weight are heavy.

You don't need the apostrophe (') here, because you're not indicating ownership

Plates: two or more plates
Plates': something that belongs to the plates

E.g. "the plates' rims were decorated with a pattern"

so,So it's difficult for me to put in a dishes machine. washer. I decided to changreplace my dishplates.

The machine you wash your plates/cups/cutlery in is called a "dish washer"

Although "change" works, "replace" sounds more natural

I am looking forward to being successful.