VBA-Wedriver-Selenium-Xpath - Modify Class Value - Click Button -Excel - html

Question

I am opening a website using Chrome Webdriver.
I wanted to Modify value to 12 instead of 10 in a box
HTML Code
<div class="input-currency input-colors">
<input type="tel" autocomplete="off" class="input-currency__input" data-test="deal-amount-input" maxlength="9" value="10" />
<div class="input-currency__values"><span class="input-currency__value">10</span> <span class="input-currency__sign psign">Đ</span></div>
</div>
My Codes
Dim Bot As WebDriver
Dim posts As WebElements, post As WebElement
Set Bot = New WebDriver
Bot.Start "chrome"
Bot.Get "https://olymptrade.com/platform#"
Bot.FindElementsByXPath("//span[contains(#class,'input-currency__value')]").Values = 12
Bot.FindElementByClass("input-currency input-colors").Text
Also there is a button of Buy with Green color, I wanted to click on it.
HTML Code
<div class="deal-buttons__item deal-buttons__item_up">
<button data-test="deal-button-up" class="deal-buttons__button deal-buttons__button_up">
<span>
<span class="deal-buttons__text">80%</span>
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="#FFF" fill-opacity="0.5" class="deal-buttons__svg deal-buttons__svg_arrow">
<path d="M14.6 8l-8.3 8.3a1 1 0 0 0 1.4 1.4L16 9.4V17a1 1 0 0 0 2 0V7a1 1 0 0 0-1-1H7a1 1 0 1 0 0 2h7.6z"></path>
</svg>
</span>
</button>
</div>
My Code
Bot.FindElementsByXPath("//span[contains(#class,'deal-buttons__text ')]").Click
Bot.FindElementsByXPath("//button[contains(#class,'deal-buttons__button deal- buttons__button_up')]").Click
I wanted to change the value and Click on buy button using selenium webdriver
provide me hint on my mistake

Answer 1

FindElements returns a collection. You want a single webElement i.e. a single item of that collection. You need to determine the appropriate index and use that or, if want first match, use methods, for example as shown below, which are singular.
Bot.FindElementByCss(".input-currency input").SendKeys "12" 'though you may need to clear element first
If need to clear first then:
With Bot.FindElementByCss(".input-currency input")
.Clear
.SendKeys "12"
End With
The button html is not provided by you but again you need singular method or index. Assuming want first, and xpath correct:
Bot.FindElementByXPath("//span[contains(#class,'deal-buttons__text ')]").Click