What does this mean?

People using screen readers are not able to see the layout of a form. To make forms accessible, they must define explicit text labels for each form control.

Usually the best solution is to use a <label> element. The label may be linked to by the form control:

<label for="name">Full name</label>
<input type="name" id="name">

or the <label> can be wrapped around the form control:

    Full name <input type="name">

Buttons are different, as their labels are specified by the code for the button, e.g.

<input type="submit" value="Send message">
<button>Send message</button>

Alternatively ARIA attributes, such as aria-label may be used, but this information will not be conveyed to visual users. For more information, see W3C's guide to labeling controls.

Hidden input fields (<input type="hidden">) do not require labels. Note that the placeholder attribute should not be used as an alternative to a label.

94.4% done

How close this website is to fixing this issue.

HTML Found on page Issues
<select id="LocationsDropdown" name="showSiteList" title="select a location">...</select> 5
<select id="WardsDropdown" name="showWardList" title="select a ward">...</select> 3
<input type="text" id="addressInput" title="address"> 1
<input class="CustomPostcode condition_search_input" id="postcodeId" name="postcodeId" placeholder="enter your own postcode?" title="Enter your postcode" type="text" value> 1
<select name="orgId" id="NHSChoicesDropdown">...</select> 1
11 distinct issues were found in the sample of 125 web pages.
More results from Aintree University Hospital NHS Foundation Trust