Beginner: Hybrid tea-rose sunburnt leaves or fungal infection?

Hello everybody!
I am new both to gardening and to this forum, so please be gentle if I get something wrong I may not know it. Also, I am not an native English speaker so my gardening terms and explanations may be primitive.
so here goes my first problem: I have recently bought and moved to a ceramic pot a pale pink tea rose hybrid. The soil was especially for roses and I also bought a gel-mineral base also designed for roses which I used as instructed once a week. I watered the plant daily just enough and it received 6+ hours of direct sun (temperatures a little bit high I think). So far, so good. After two weeks (meaning these days) I noticed that some leaves have turnt like this -> see photos. I don’t know if it is sunburn or fungus or anything! I also searched the internet for something similar and I didn’t find an answer(or maybe I don’t know where or how to ask).. I don’t want to lose the rose as I’ve read that these types of roses are very hard to maintain and that’s why 

every change stresses me a lot. Hope you don’t mind looking into this and giving me some advice.
Best regards,
Allie
I am new both to gardening and to this forum, so please be gentle if I get something wrong I may not know it. Also, I am not an native English speaker so my gardening terms and explanations may be primitive.




Best regards,
Allie
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Posts
My instinct is the same as yours ... that they've been sunburnt ... possibly the plant was kept in a more sheltered spot at the nursery.
However @Marlorena is very knowledgeable about roses ... hopefully she'll see this thread and give you some sound advice.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Otherwise, there is very little wrong with your rose, and nothing much to worry about... it's a pretty rose..
Please make sure you have sufficient drainage holes at the bottom of your pot for the water to drain away..
The reason behind all my extra care is that 5 years ago I had another mini rose bush and after two weeks it completely died and that was the end of my trying to keep a flower in a pot.
I will do as you said, hope I’ll keep it alive and healthy. Thank you!
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Allie