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Go to https://docs.google.com/presentation/ in your computer's web browser. This will open your Google Account's Google Slides page if you're logged in. If you aren't logged into a Google Account, enter your email address and password when prompted before continuing. It's in the upper-left side of the page. Doing so opens a blank presentation. You can remove the pre-formatted title text boxes by doing the following:  Click a blank space on the slide. Press Ctrl+A (Windows) or ⌘ Command+A (Mac) to highlight the whole slide. Press the Del key (Windows) or the backspace key (Mac). It's a tab in the upper-left corner of the page. Clicking it prompts a drop-down menu. On a Mac, make sure you're doing this on the page rather than in your Mac's menu bar that's at the top of the screen. It's in the Insert drop-down menu. You should see your cursor turn into a cross. Click and drag from the top-left corner of the slide to just before the middle of the slide, then drag down to the bottom of the slide. This will be your card's left page. Type your card's message into the text box. You can center your text by highlighting the text, clicking the "Align" tab (which resembles four stacked horizontal lines), and clicking the "Center" option which is the second icon from the left in the resulting drop-down menu. If you want to use an image inside of your card, make sure the image is on your computer, then do the following:  Click Insert. Select Image in the drop-down menu. Click Upload from computer in the pop-out menu. Select an image, then click Open or Choose. Resize the image by clicking and dragging its corners inward or outward. Click and drag the image to the location on the slide in which you want to store the image. You'll do this by adding a text box to the right side of the slide:  Click Insert, then click Text box in the drop-down menu. Click and drag from the top-right corner to close to the middle of the slide, then drag down to the bottom of the card. Enter your text and images if necessary.
Open Google Slides. Click Blank. Delete the slide's contents. Click Insert. Click Text box. Create your text box on the left side of the slide. Enter any text you want to use. Add an image if desired. Create the card's second inner page.