1- Open Affinity Designer.
2- Open a new document and create a shape.
3- To use the alignment options you can select it on the top toolbar icon and a drop down box will appear.
4- Another way is to go to Layer> alignment and then select the alignment type.
5- If you want to add your alignment options as quick keys on your toolbar, you can do this by accessing View > Customize toolbar.
6- A new window will pop up.
7- Find the quick keys you want to add to your toolbar and click and drag to your toolbar.
8- You can place the align quick keys anywhere on the tool bar. then select done on the window.
9- You can now use these quick keys to align your designs.
10- If you find that you only use a few of the quick keys on the tool bar you can re adjust the quick keys. go to View > Customize toolbar.
11- The window will pop up and you can now remove the align quick key tool bar. to do this just click and drag off your toolbar. drag it anywhere on your design space and it will disappear.
12- Where the gap is you can now add the individual quick keys.
13- Select the quick keys and as before you can drag them to your toolbar. Select close.