Not sure what to put in email requesting tribunal?

Hi
Please can I ask for some advice? I've checked the members online guide but my brainfog and anaemia is making it difficult to absorb the information.
I have been refused pip and after being told the mr would take many months during which I would have more time to submit further medical evidence due to the pandemic (and not to risk my safety by trying to obtain/photocopy and post it out) I received a letter saying it has been done and decision is same.
So I'm in the difficult position as I know we all are of not being able to get copies of my evidence to send plus I do not have a working computer and typical my phone which is old given to me by a friend 2 yrs ago has developed a problem with syncing my emails so I have very limited access to the internet.
I have setup an account to register the tribunal request for appeal but keep getting refused further access? I rang them twice for advice and they said I should submit a direct appeal request via email with a photograph attached of my mr letter. I am delayed in doing this as I'm not exactly sure when the letter arrived it was dated early june but I didn't get it until july plus I've been very unwell with an infection ontop of my existing illhealth and had to endure a lot of pain whilst trying to fight the infection as my health conditions means I cannot tolerate oral antibiotics, last time I took some I ended up in hospital for nearly 2 wks on a drip.
I am also really struggling with what to put in the email? Do I include the reasons I feel I should have been awarded pip or does that come later at the tribunal hearing? Also do I request an oral hearing as I read its best to do so to avoid a paper based appeal?
Many thanks for any help and I'm sorry this post is so long.
Take care

Hi Gordon.

Thank you very much for your reply.
I tried yet again earlier and got a bit further with the online form not sure why it keeps refusing access and I'm worried they won't believe me that I'm having so much difficulty with my internet access. I can send emails at present as far as I know but I haven't received any since last week. I think its best if I can try to complete the request online if possible.
I will have another look at the advice you suggested and the completed form.
Thanks again for helping me.
Take care