Configuration Questions (How To)

I subscribed bundle, downloaded and installed Adora Quickstart template correctly on local server XAMPP.
But i have these challenges:
1. Modules weather, map, social icon, currency open in the module manager with limited option which make them difficult to configure.
For Weather, when i edit, it opens with "show full description link". when i click on the link, nothing happens. How do i go about these?
2. How can i change the USD currency uni ton the Reservation page to my local currency?
3. How can i add another payment gateway (interswitch) to the existing ones?
4. How do i change the Adora favicon to a custom one?
5.I want to place a snippet after the </form>tag and before the </body>tag so that a Button should be displayed on the reservation page. Please how do i go about it?
Thanks for your help in advance.

Dear Vietvh,
Thank you so much for your response to my problems.
I have gotten solution to my questions 1 to 4. But i am yet to get answers to these:
1. For No. 5, i want a PAY NOW button customized by our bank to appear on the Reservation Page (2) Guest Info & Payment under PAYMENT INFORMATION where PayPal and other options are. This is because i want it to serve as one of the payment options.
2. How can i customize any of the existing payment options, say PayPal, to our hotels? Can i use the merchant ID our bank gave us?
Thank you in advance for your support.

Dear Vietvh,
Thank you so much for your response to my problems.
I created a payment plugin as you advised using unionpay plugin as example. Installed it and an error message shows:
Error: c:/xampp/htdocs/mysite/tmp/install/55662341/en-GB/en-GB.myplugin.inidoes not exist.
I also pasted the snippet my bank gave me for configuration at the location where they said i should in the form. My questions are:
1. I want a my payment option to be among the rest on the front end (it only appears at the admin"s)
2 . I want Pay Now button to appear when chooses my banks payment option.
Below is the snippet and the instruction from my bank:

INSTRUCTION:
Copy EITHERof the JavaScript snippets below to your payment page where the PAY button should be displayed. Please
note that the snippet should be placed after the </form>tag and before the </body>tag.

SNIPPET:
<script type="text/javascript"
src="mybankwebpay.mybankwebsite.com/customerp...tServices/UPaybutton.
ashx?mercId=<merchant_id>& CurrencyCode=<crr_code>"></script>
<script type="text/javascript">
upay_settings.setAmount(<amount>);
upay_settings.setOrderId(<order_id>);
upay_settings.setProduct(<product_name>);
upay_settings.setEmail(<customer_email>);
</script>

Please let me know where to paste the above either on the form, or any other file so my bank payment option will be among the rest or a PAY NOW button customized by our bank to appear on the Reservation Page (2) Guest Info & Payment under PAYMENT INFORMATION where PayPal and other options are.

Thank you in advance.