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Hello, my names Liam.
I'm located in Sydney AUSTRALIA.
I've got a Lots a Lemons Dwarf Lemon Plant & I potted it around 1 month ago.
I used Debco Citrus Potting Mix & water it around twice a week, I have also used Seasol & Powerfeed fertiliser.
The leaves have got browning appearing and yellowing.I've attached some images to show this?

The leaf looks like something ate it. I get that sometimes, but I just pick off the leaf. I don't know what those fertilizers are, they are not available here. Citrus plants are acid loving plants they like an acidic fertilizer and pH around 6.0. Yellowing could be from nitrogen, either not enough, or hi pH, or it could be the way you water. To check it I would hit it with something like Miracle grow for acid loving plants. For me twice a week would be starving my plants, them like water every day. I use pure cinders because I don't like to repot. The cinders provide a lot of air space, but they dry out fast.